Additional evidence of an exothermic reaction issound

The complete electron configuration for As³⁻ is; 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶. Option C is correct.

The correct electron configuration for As³⁻ (the ion of arsenic with a charge of -3) is:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶

The electron configuration represents the arrangement of electrons in the energy levels and orbitals of an atom or ion. In the case of As³⁻, we start with the electron configuration of the neutral atom arsenic (As), which is:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p³

To form the  As³⁻ ion, three additional electrons are gained, filling the 4p orbital completely:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶

Hence, C. is the correct option.

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--The given question is incomplete, the complete question is

"Give the complete electron configuration for As³⁻. A) 1s²2s²2p⁶3s²3p⁶4s²4p⁶ B) 1s²2s²2p⁶3s²3p⁶4s²4d¹⁰4p⁶ C) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ D) 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁴ E) 1s²2s²2p⁶3s²p⁶4s²3d¹⁰4p⁶."--

The total mass of 4 tin is in grams is 580 grams and in kg is 0.58kg.

One tin of chopped tomatoes weight is 145 grams

and we have to calculate it for 4

so for 4

145*4 =580 grams

and we have to change it into kilograms so

580 /1000  = .58kg

By 1,000, divide the number of grams.

To convert from grams to kilograms, simply divide by 1,000 because there are 1,000 grams in every kilogram. If necessary, construct the equation using fractions. Put the number of grams over 1 and divide it by the conversion factor, which is 1 kg / 1,000 g. Your answer in kilograms will result from the cancellation of the grams. Remember to use the appropriate units to mark your response.

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Answer: seawater at pH 8 has the greatest concentration of hydroxyl ions[OH-].Thus, option (c) is the correct answer.

Explanation:

When the pH value increases from 7 to 14,it represents increase in the OH- ion concentration.pH scale determines the acidity or basicity of the solution.The value below 7 represents that solution is acidic and above 7 represents that solutions is basic.

The pH of pure water at room temperature is 7.It means it is neither acidic nor basic,it is neutral.The pH value of Battery Acid is 0 which means it is highly acidic.The pH value of Liquid drain cleaner is 14 which means it is highly basic.

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Answer:

Explanation:

Answer:

1.8 g of Pb(NO3)2

Explanation:

Find the moles of sodium chloride used by multiplying the molarity by the volume of sodium chloride.

Molarity = mol/L

Convert 23.5 mL to L.

23.5 mL x (1 L/1000 mL) = 0.0235 L

Multiply molarity by volume.

0.55 M = mol/0.0235 L

(0.55 M)(0.0235 L) = mol

mol = 0.012925

You have the moles of sodium chloride used so you can convert this to moels of lead (II) nitrate with stoichiometry. First, you need the balanced chemical equation.

Pb(NO3)2 + 2 NaCl -> PbCl2 + 2NaNO3

Convert 0.012925 mol NaCl with mole to mole ratio. In this case, it's 1:2.

0.012925 mol NaCl x (1 mol PbCl2/2 mol NaCl) = 0.0064625 mol PbCl2

Convert moles of PbCl2 to grams with molar mass.

0.0064625 mol PbCl2 x (278.10 g/1 mol) = 1.79722... g

Round to sig figs.

1.8 grams of PbCl2

The solution to the equation and value of variable 21(3d - 4) + 100 = 58 is d = 2/3.

Solve the equation 21(3d - 4) + 100 = 58, we can begin by simplifying and isolating the variable:

21(3d - 4) + 100 = 58

Distribute 21 to the terms inside the parentheses:

63d - 84 + 100 = 58

Combine like terms:

63d + 16 = 58

Subtract 16 from both sides:

63d = 42

Divide both sides by 63:

d = 42/63

Simplifying the fraction gives:

d = 2/3

The solution to the equation is d = 2/3.

The solution to the equation 21(3d - 4) + 100 = 58 is d = 2/3. By simplifying the equation, we find that dividing both sides by 63 results in the solution of d = 2/3, which satisfies the original equation.

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Answer:

0.0875M of Acetic Acid

Explanation:

Based on the reaction of acetic acid (HX) with sodium hydroxide (NaOH):

HX + NaOH → NaX + H₂O

1 mole of acetic acid reacts with 1 mole of NaOH

That means the moles of sodium hydroxide added = Moles the acetic acid at the equivalence point.

To solve this question we have to find the moles of NaOH = Moles HX. With the moles and the volume (25.0mL = 0.0250L) we can find the molarity of the acetic acid:

Moles NaOH = Moles Acetic acid:

12.5mL = 0.0125L * (0.175mol / L) = 0.00219 moles Acetic Acid

Molarity acetic acid:

0.00219 moles Acetic Acid / 0.0250L =

A solution is defined as a mixture of two or more substances, usually, a solute and a solvent, and the difference between these two are in quantity, solute represents the smallest amount and solvent will represent the highest amount, and while you can have more than one solute, you can only have one solvent for a solution. Therefore the statement is true

An electron should contain 8 electrons within its outer shell, according to the octet rule. Therefore, octet rule gives stability to an element.

An electron should contain 8 electrons in its outer shell, according to the octet rule, which is a general chemical rule of thumb. Furthermore, it is observed that, with the exception of a few atoms from the p block identified as hydrogen, lithium, as well as helium, the majority of the elements from the s-block and p-block adhere to this norm.

For instance, the component carbon dioxide adheres to the "Octet Rule," which governs the binding of information. An electron should contain 8 electrons within its outer shell, according to the octet rule, a general chemical rule of thumb.

Therefore, octet rule gives stability to an element.

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Answer:

C: salt is dissolved into freshwater

D: salt is dissolved into freshwater

F: frying changes the color and texture of an egg

G: ocean water evaporates to water vapor on a hot day

Answer:

Since both H2 and H2O have the same ratio in the balanced equation, if you have 20 moles of H2 you will also get 20 moles of H20.

Hope this helps!

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The half-life of radon-222 is 3.8 days, which means that after 3.8 days, half of the original amount will remain, and after another 3.8 days, half of that remaining amount will remain, and so on.

We want to know how much of a 64 gm sample of radon-222 will remain after 7 days. We can start by calculating how many half-lives have passed in 7 days:
7 days / 3.8 days per half-life = 1.84 half-lives
This means that 1.84 half-lives have passed since the original sample was taken. We can use this information to calculate how much radon-222 remains:
Amount remaining = original amount * (1/2)^(number of half-lives)
Amount remaining = 64 gm * (1/2)^(1.84)
Amount remaining = 64 gm * 0.221
Amount remaining = 14.14 gm (rounded to two decimal places)

Therefore, after 7 days, only 14.14 grams of the original 64 grams of radon-222 will remain.

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Answer:

λ = 2.38 × 10^(-7) m

Explanation:

We are given the work function for palladium as 503.7 kJ/mol.

Now let's convert this to KJ/electron.

We know from avogadro's number that;

1 mole of electron = 6.022 × 10^(23) electrons

Thus,

503.7 kJ/mol = 503.7 × 1/(6.022 × 10^(23)) = 8.364 × 10^(-22) KJ/electron = 8.364 × 10^(-19) J/electron

Formula for energy of a photon is;

E = hv

Where;

h is Planck's constant = 6.626 × 10^(-34) J.s

v is velocity

Now, v = c/λ

Where;

c is speed of light = 3 × 10^(8) m/s

λ is wavelength of light.

Thus;

E = hc/λ

Making λ the subject, we have;

λ = hc/E

λ = (6.626 × 10^(-34) × 3 × 10^(8))/(8.364 × 10^(-19))

λ = 2.38 × 10^(-7) m

Answer:

only 2.5% is fresh water on earth

Answer:

The answer is 3%

Explanation:

The volume of Neon gas is 326.5 L in 8. 9 * 10 ^ 25 atoms as per the ideal gas law equation.

The given atoms of Neon gas =  8. 9 * 10 ^ 25

To calculate the volume of any gas we should use the ideal gas law equation.

PV = nRT

Here R is the universal gas constant.

To calculate the volume, we need to calculate the number of moles of neon gas. Avogadro's number is used to convert the number of atoms to moles:

1 mole of neon gas = 6.022 * 10^23 atoms of neon gas

The total number of moles of neon gas is:

8.9 * 10^25 atoms / 6.022 * 10^23 atoms/mol = 14.79 mol

Let's assume the temperature is 25°C  = 298 K

The pressure = 1 atm.

The value of R =  0.08206 Latm/(molK).

PV = nRT

V = (NRT) / P

V = (14.79 mol * 0.08206 Latm/(molK) * 298 K) / 1 atm

V = 326.5 L

Therefore we can conclude that the volume of Neon gas is 326.5 L.

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We say that the limiting reactant is the one that gets consumed first in a reaction and therefore limits the production of products.

Here we burn a candle made of wax with oxygen from the air, and it is `produced energy, CO2, and water.

If we limit the amount of oxygen in the available air, the candle's flame eventually goes out once it uses up all the O2.

O2 molecule of

Answer: the limiting reactant is the O2 from the air.

The solute in a vodka martini is alcohol.

In a vodka martini, the solute refers to the substance that is dissolved in the drink. In this case, the solute is alcohol, as vodka is an alcoholic beverage. The question states that the vodka martini contains 30% alcohol, which means that 30% of the drink is composed of the solute, alcohol. The remaining portion of the drink, which is 70% in this case, is composed of water, making it the solvent.

In a solution, the solute is the component that is present in a smaller quantity and is dissolved in the solvent. The solvent, on the other hand, is the component that is present in a larger quantity and does the dissolving. In the context of a vodka martini, the alcohol is the solute that is dissolved in the water, which acts as the solvent.

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As the magnitude of the charge increases, the emf decreases.

The emf of a charge is the amount of energy provided to each coulomb of charge passing through a given battery.

The relationship between magnitude of a charge and the emf is given as;

\(emf = \frac{E}{Q}\)

where;

Thus, we can conclude that as the magnitude of the charge increases, the emf decreases.

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Answer:

3.97 x 10^-19 J

Explanation:

The energy E of a photon is given by:

       E = hf where h = Planck's constant = 4.14 × 10−15 eV · s and f = frequency

In this case, f = 6×10^14s−1, hence, the energy E of one photon of the light would be;

E = 4.14 × 10−15 eV · s x 6×10^14s−1

               =  2.484 eV

Note that:

1 eV = 1.60 × 10−19 J

Hence,

2.484 eV = 2.484 x 1.60 × 10−19 J

              = 3.97 x 10^-19 J

Answer:

Single displacement (Substitution)

Explanation:

Physical changes occur in dairy products when water is simply evaporated from milk (powdered milk and sweetened condensed milk).

What is  physical change?

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C, 0.746 mol Ag.

1 mol Ag = 6.022 x 1023 atoms of Ag -> 4.49 x 1023 atoms of Ag x 1mol Ag/6.022 x 1023 atoms -> 0.746 mol Ag

The moles of Ag that contain 4.49  \(\rm \times\;10^2^3\) atoms have been 0.745 moles.

The number of atoms in a mole can be given by the Avagadro number. The Avagadro number has been equal to the number of atoms in a mole of compounds. The Avagadro number has been constant with a value of 6.023 \(\rm \times\;10^2^3\).  

6.023 \(\rm \times\;10^2^3\) atoms = 1 mole

So, for the given 4.49  \(\rm \times\;10^2^3\) atoms:

4.49  \(\rm \times\;10^2^3\) atoms = \(\rm \dfrac{1}{6.023\;\times\;10^2^3}\;\times\;4.49\;\times\;10^2^3\) moles

4.49  \(\rm \times\;10^2^3\) atoms = 0.745 moles.

The moles of Ag that contain 4.49  \(\rm \times\;10^2^3\) atoms have been 0.745 moles.

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Answer:

They forge heavy elements in their cores, explode as supernovas, and expel these elements into space.

Explanation:

Answer:

Acceleration is defined as the rate of change of velocity. ... For a particular interval, the average acceleration is defined as the change in velocity for that particular interval. Unlike acceleration, the average acceleration is calculated for a given interval.

Answer:

diagram C best represents the mixture

Answer:

Activation energy :)

Explanation:

The activation energy starts the reaction! Without it, we would not find out the solution!

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